GhostTube SLS Camera Alternate is a paranormal investigation app, specifically a simulation tool that mimics the functionality of a real SLS (Structured Light Sensor) camera. Instead of using actual depth-sensing hardware, it relies on your phone's camera and augmented reality to detect and display supposed humanoid figures. I first heard about it from a friend who watches ghost hunting shows, and being a bit curious, I decided to download it from the Google Play Store. It's free to install, and I didn't need to register an account, which was a plus. The first impression after launching it was a bit mixed; the interface is simple, almost too plain, with a live camera feed and a few on-screen buttons. It didn't exactly scream "polished experience," but for a niche tool, that kind of simplicity can be a good thing.

Once you start using it, the main action is basically pointing your phone around a room and waiting for the app to "detect" something. The actual hands-on experience is a little clunky. You can switch between different sensitivity levels, which changes how easily it picks up stick figure silhouettes. In practice, walking through my basement, the app would occasionally flash a quick stick figure on the screen, which was a little startling the first time. However, the tracking is not very smooth; the figures often appear and disappear instantly, and sometimes show up on reflective surfaces or corners of furniture. A small tip I discovered is that it works best in low light and against plain walls, as the AR detection gets confused by clutter. The onboarding is non-existent; you just open it and figure out what the buttons do, which is fine if you are already familiar with SLS technology.

After using it for a few evenings, my judgment is that this is a very specific tool for a very specific crowd. If you are part of a paranormal investigation group and want a low-cost, low-barrier way to add an SLS-like element to your sessions, this app is worth the download. But if you are just the average person looking for a spooky game or a reliable ghost hunting app, this will likely feel like a gimmick. What makes it different from apps like "Ghost Detector" or "Spirit Radar" is that it sticks to one visual mechanic, without any audio recorders or EMF meters. It feels more like a genuine replication of a real tool than a toy. I kept it installed for a while to show friends, but honestly, the novelty wears off quickly because the responses feel random. Compared to something like "NECROBOT," which has a more complex feedback loop, this one feels shallow and might get uninstalled sooner rather than later.

• 🕹️ The standout feature is the SLAM-based skeleton tracking that places virtual stick figures into your real-world environment through the phone camera. Unlike "Spirit Hunters" which uses generic radar visuals, this app attempts to map the room geometry and overlay humanoid shapes that can "walk" behind furniture or down hallways, giving a much more immersive investigation feel.
• 🕹️ The sensitivity adjustment system is actually useful for different environments. In a noisy area, I set it to low to reduce false positives, while in a basement, cranking it up catches more figures. This is a step above "GhostScope," which has no such controls and just floods the screen with random shapes.
• 🕹️ The ability to record video directly from the app is a practical touch. Unlike many competitors where I have to screen record separately, GhostTube SLS Camera Alternate lets me capture evidence live with a single button press, and the timestamp is burned into the video for later review.
• 🕹️ The calibration tool that lets you define the floor plane is surprisingly helpful. It stops figures from floating in mid-air or clipping through tables unrealistically, which is a common problem in apps like "Paranormal AR." It adds a layer of believability that serious users will appreciate.

• ✅ It uses real AR tracking technology to map room surfaces, which is more advanced than "Ghost Hunter M2," which just randomly places ghost images on the screen without any spatial awareness.
• ✅ The sensitivity slider is a practical feature; I can filter out false positives more effectively than in "Spirit Scanner," where the detection just seems completely random.
• ✅ It is fully free with no ads interrupting the investigation session, which is a huge improvement over "Phantom Radar," which forces a video ad after every five minutes of use.

• ❌ The detection feels inconsistent and often triggers on shadows or bright spots, while "Spirit Talker" has more consistent, less twitchy response patterns.
• ❌ There is no audio or EMF integration built-in, so I have to run a separate app like "Ghost Tube EMF" alongside it, which gets tedious.
• ❌ The app has not been updated in a while, and on newer Android versions, it sometimes crashes on launch, which is not an issue I have with "NECROBOT," which gets regular patches.